01287nas a2200145   4500008004100000245005300041210005300094260002400147520086300171100001501034700001201049700001501061700001601076856004901092       2020                        eng d00aTHz Transmission through Submillimeter Apertures0 aTHz Transmission through Submillimeter Apertures  aBuffalo NYc11/20203 a<div>Terahertz near-field microspectroscopy is emerging as an essential tool for characterization of novel materials and biomolecules. It is important to ensure the near field geometry used does not introduce spectral artifacts. For example, many scanning techniques can be strongly influenced by the interaction between the scattering tip and the sample. Here we examine the spectroscopic effects of a 200 μm diameter aperture for THz near-field measurements. We use HFSS to model free-space transmission through samples with resonant absorbance as a function of sample thickness, lateral sample width, and aperture diameter. We examine the transmitted power and spectral fidelity for coupling of transmitted THz light onto a detector. These studies inform corrective post-measurement analysis algorithms and design of near-field detection systems.</div>
1 aLaFave, T.1 aLee, A.1 aKao, T.-Y.1 aMarkelz, A.  uhttps://ieeexplore.ieee.org/document/9370923